Biodegradation of Spilled Diesel Fuel in Agricultural Soil: Effect of Humates, Zeolite, and Bioaugmentation

Table 2

Total phospholipid fatty acids (mg PLFA/kg dry soil, average values ±95% Bonferroni intervals) as an effect of additives in bioaugmented variants (II to XV).

Time; (days)	Zeolite; (XV)	Humates + zeolite; (IX–XIV)	Humates only; (III–VIII)	No amendments; (II)
0	8.9±3.4^abc	12.7±1.6^a	13.6±2.3^ab	15.7±7.5^abc
28	11.6±2.8^abc	12.4±1.7^a	16.1±2.4^abcd	15.0±13.0^abcd
91	𝟏𝟔.𝟓±𝟑.𝟒^𝐚𝐛𝐜𝐝𝐞𝐟	𝟏𝟑.𝟑±𝟏.𝟓^𝐚	𝟐𝟏.𝟕±𝟐.𝟐^𝐞𝐟	𝟏𝟐.𝟎±𝟕.𝟓^𝐚𝐛𝐜𝐝𝐞
147	𝟏𝟔.𝟑±𝟐.𝟖^𝐚𝐛𝐜𝐝𝐞𝐟	𝟏𝟖.𝟕±𝟏.𝟔^𝐜𝐝𝐞	𝟐𝟒.𝟎±𝟐.𝟐^𝐟	𝟏𝟔.𝟔±𝟕.𝟓^𝐚𝐛𝐜𝐝𝐞
203	21.1±2.8^abcdef	21.1±1.7^def	22.6±2.0^ef	19.4±7.5^abcdef
273	15.2±3.4^abcdef	18.3±1.5^bcde	20.7±2.0^def	22.7±13.0^abcdef

Letters indicate homogenous groups of the values (Bonferroni test).
Bold-font rows indicate sampling times with significant differences in PLFA concentrations.